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Old 02-20-2006, 04:07 AM   #1
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Default Exhaust leak cause bad gas mileage? *Update 2*

My car is stock enternally. Its hypertech tuned, magnaflow exhaust, 160* stat, granatelli maf, and whisper lid.

I'm not really a lead foot but my gas mileage sucks. Almost to the point that I'm gonna look for a leak.

I went over a speedbump to hard and I have a minor exhaust leak. I can barely hear it but its there and I think thats causing the check engine light. Wouldn't it cause a CEL if it was infront of the o2 sensor? Would that cause uncharacteristically bad gas mileage?

I normally shift around 1900 to 2500rpms because the speedlimit on base isn't over 30mph anywhere.

I only got like 50miles to a half tank.
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Old 02-20-2006, 11:10 AM   #2
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check for fuel leak, hit up dansredz28 on phfba........ he's usually willing to lend a hand when his wife is working.

I get 11-14 mpg with an a4, If i'm playing with a heavy foot, goes down to 9mpg
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Old 02-20-2006, 09:28 PM   #3
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fuel leak for real? I guess that would make sense.
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Old 02-20-2006, 10:18 PM   #4
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50 to a half tank is insane if you don't have a fuel leak. I usually hit 50 miles before I even go through the first 1/4 tank.

An exhaust leak can screw up gas mileage, but it has to be close enough for the O2s to be catching outside air. The O2s then see the mixture as too lean, and the computer compensates by adding fuel. The granatelli MAF probably isn't helping either.
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Old 02-21-2006, 11:49 AM   #5
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Lose the granatelli maf? Do those even do anything? I have the stock one. The original owner put the aftermarket maf on it.
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Old 02-21-2006, 02:47 PM   #6
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I have numerous exh leaks and my car still gets like 50 outta a 1/4 tank......
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Old 02-21-2006, 02:56 PM   #7
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Quote:
Originally Posted by Justin00SS
Lose the granatelli maf? Do those even do anything? I have the stock one. The original owner put the aftermarket maf on it.
Go back to the stock one. Aftermarket MAFs are hit or miss, and the stocker has been proven to do fine until 500hp.

Still, 50 miles out of a half tank is ridiculous. That fuel has to be going somewhere and it isn't exactly safe to drive the car if it's leaking.
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Old 02-21-2006, 03:33 PM   #8
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I think I may have a clogged injector. I took the car to an exhaust shop today and the only leaks they could find are near the muffler where the magnaflow slides onto the pipe. Not anywhere near and o2 sensor.

I scheduled an appointment for tommorow with an auto repair place to get the codes the computer is throwing out.

I can hear a slight miss in the exhaust and when I'm buy the engine. Its not causing the engine to vibrate to bad but it is a little shaky.

If I get the codes then can someone on here tell me what they mean? I'd like to save myself some money and fix it myself. If its just an injector then I know I can do that.
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Old 02-23-2006, 04:32 AM   #9
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I went to checkers and rant he diagnostic myself and this is what I got.

The trouble code is it throwing for the SES light is : P0420

Which means, "Catalyst system Efficiency Below Threshold (Bank 1)

What does this mean? I have to buy new cats? New o2 sensor?

What if I seafoamed my car could that burn some of the stuff out of the cats?

Lemme know what you guys think please.

I replaced the granatelli maf with the stock one and got back ALOT of gas mileage. I mean ALOT!
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Old 02-24-2006, 03:56 AM   #10
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Well. Here is what happened today. I've gotten my gas mileage back since replacing the gran maf with the stock maf. SES light still on. I start my car up today after it sitting at work for a couple of hours and I had to give it some gas to keep it above 250rpms. I was like WTF! THIS PIECE OF SHIT!

It started sputtering, popping, shimmying I am the whole time like OMG MY FUCKING CAR IS FUCKED! WTF!

Then she roared back to life. I'm just sitting there like uhhhhh.

Purring like a ******* lion. The SES light went off. Its not on anymore. She idles so much more smoothly. And the light misfire that I could hear in the exhaust. Not there anymore. Just a nice rumble of the LS1.

Runs soo much smoother and better now. I dunno wtf but it seems to be fixed.
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Old 02-24-2006, 03:56 AM
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